KR20010078180A - Oral cavity washer with video scope - Google Patents

Abstract

PURPOSE: To solve such a problem that it is difficult heretofore to actually confirm such a state that a place observed by a videoscope coinsides with a place where a liquid is ejected to collide with an object by an image. CONSTITUTION: The videoscope, which has a prism mirror 10 and an object lens 9 both of which forms the light from an object into an image, a CCD unit 8 for converting the light formed into the image to an electric signal and a first grip part held by an operator, and an oral cavity washer, which has a display part for displaying the image taken by the videoscope, a nozzle 1 for ejecting a liquid and a second grip part held by the operator and ejects a fluid to teeth or the gum to wash the oral cavity are provided. Since the first and second grip parts are integrated as a grip part 5, the image of a washing object can be taken even during washing operation.

Description

Oral scrubber with video scope {ORAL CAVITY WASHER WITH VIDEO SCOPE}

The present invention relates to a video scope incorporating an imaging device such as a CCD for capturing an image of the interior of the oral cavity, and to an oral scrubber that cleans the interior of the oral cavity by spraying a fluid such as water on teeth or gums. It is about.

In recent years, a video scope using a CCD capable of imaging a local position while illuminating the operator to examine the affected area of the oral cavity in dentistry, oral surgery, etc., and to observe the condition of his teeth or gums. Is being used. In addition, at home, an oral irrigator for dispensing water into teeth or gums for the purpose of cleaning the inside of the oral cavity is becoming widespread.

The video scope for imaging such local positions and the nozzle portion for injecting the liquid of the oral irrigator need to be held and operated by one hand.

In the past, video scopes and mouthwashes were used separately. In particular, it was necessary to observe the gums and the gums on which the leftovers were attached, spray water on the parts and remove them, and then confirm the results with the video scopes. In this case, it is difficult to actually confirm with the image that the position observed with the video scope coincides with the position where water is sprayed.

In addition, since the inside of the oral cavity is generally cleaned in a limited space such as a washing place, it is sometimes difficult to secure a space in which a display unit for newly displaying a video scope is provided in a general household.

Furthermore, in order to observe or clean all teeth or gums seamlessly, video scopes and nozzles require complicated manipulations, such as movement or rotation, which is desirable.

1 is a side view of a portion of an oral irrigator with video scope in accordance with a first embodiment of the present invention

FIG. 2 shows that the oral irrigator is replaced with a toothbrush in the oral irrigator with the video scope of FIG.

3 is an overall view of an oral irrigator with video scope in accordance with each embodiment of the present invention.

4 is a side view of a portion of an oral irrigator having a video scope according to the second to fifth embodiments of the present invention;

5 is a side view of a portion of an oral irrigator having a video scope according to a sixth embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: nozzle 2: pipe

3: tube 4: wire

5: grip part 6: control switch

7: Video scope stand 8: CCD unit

9: objective lens 10: prism mirror

11: white LED 12: optical screen

13: head of the video scope 14: hinge

In view of this, the present invention provides an oral irrigator having a video scope capable of cleaning the inside of the oral cavity while actually confirming with the image that the position observed by the operator with the video scope coincides with the position where the fluid is sprayed. It aims to do it.

A first aspect of the present invention provides a video scope having image forming means for forming light from an object, an image pickup device for converting light formed by the image forming means into an electrical signal, and a first grip portion held by an operator; An oral irrigator having a display unit for displaying an image captured by the video scope, a nozzle for injecting a fluid, and a second grip unit held by an operator to clean the oral cavity by spraying the fluid on teeth or gums; An oral irrigator with a video scope, wherein the first grip portion and the second grip portion can be integrated.

The point at which the jetted liquid collides with the object for cleaning, that is, the teeth or gums, is located in the imaging range of the video scope, and the cleaning operation can be performed while confirming the cleaning position with an image. In this way, when the liquid is sprayed and the position where the liquid is injected is confirmed by an image, not only the cleaning but also the stimulation of the gums and the like can be expected by the pressure of water, thereby improving practicality.

According to a second aspect of the present invention, in the first invention, the display unit displays an aiming marker indicating an arrival target point of the fluid ejected from the nozzle on an image captured by the video scope. It is an oral irrigator with a woofer.

According to a third aspect of the present invention, in the first or second aspect of the invention, the third grip portion and the first grip portion can be integrated by adding a toothbrush portion having a brush portion and a third grip portion held by an operator. Is an oral irrigator with video scope

A fourth aspect of the invention is an oral irrigator having a video scope according to any one of the first to third inventions, wherein lighting means for illuminating the object is added.

A fifth aspect of the invention is the invention of any one of the first to fourth aspects of the invention, wherein the video scope has an optical screen for transmitting light from the object and is removed for removing deposits on the optical screen. And means for forming the light from the object having passed through the optical screen, wherein the image forming means is an oral irrigator with a video scope.

A sixth aspect of the present invention is the oral irrigator having a video scope according to the fifth aspect of the invention, wherein the removing means is an ejecting means for ejecting a fluid.

According to a seventh or sixth aspect of the present invention, there is provided an oral irrigator having a video scope, wherein fluid is sprayed alternately on the object and the optical screen.

The eighth aspect of the present invention is the oral irrigator having a video scope according to the sixth or seventh invention, wherein the nozzle acts as the jetting means.

According to a ninth aspect of the present invention, in the seventh or eighth invention, the nozzle pulsates and injects the fluid, and the fluid is alternately ejected to the object and the optical screen in synchronization with the pulsation. An oral irrigator with video scopes.

The tenth aspect of the present invention is the video scope according to any one of the sixth to ninth aspects, wherein the injection speed of the fluid on the optical screen is controlled to be lower than the injection speed of the fluid to the object. It is a mouthwash having.

The eleventh aspect of the present invention is the oral irrigator of the fifth aspect, wherein the removing means is a vibrating means for vibrating the optical screen.

12th this invention is control in which any one of 5th-11th invention is provided in the said 1st grip part, the said 2nd grip part, or the said 3rd grip part, and controls the operation | movement of the said removal means. It is an oral irrigator with a video scope characterized by the addition of means.

According to a thirteenth aspect of the present invention, in the invention of any one of the fifth to twelfth inventions, the optical screen is subjected to water-repellent treatment, and the transmission of visible light is ensured. It is an oral irrigator with a woofer.

A thirteenth aspect of the present invention is the oral irrigator of the thirteenth invention, wherein the waterproofing treatment uses a dimethyl silicone organic polymer waterproofing agent or a silane binder having a linear alkyl bond.

According to a fifteenth aspect of the present invention, in the invention of any one of the fifth to twelfth inventions, the optical screen is subjected to hydrophilic treatment, and has a video scope characterized in that it is transparent to visible light. Mouthwasher.

According to the sixteenth aspect of the present invention, in any one of the first to fifteenth aspects of the present invention, the display portion is a charger for charging a device installed in the first grip portion or the second grip portion, or the first one when not in use. It is an oral irrigator with a video scope characterized in that it is installed in the mounting apparatus in which a grip part is installed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)

Best Mode for Carrying Out the Invention Embodiments of the present invention will now be described with reference to Figs.

In an embodiment of the present invention, the nozzle for injecting the liquid into the object may be replaced with a toothbrush. These can be cleaned with a toothbrush as well as with a jet of liquid if necessary. This exchange function is used not only for liquid spraying but also for this wiping.

1 is a side view of a portion of an oral irrigator having a video scope in accordance with the present invention. In Fig. 1, reference numeral 1 denotes a nozzle for injecting liquid, reference numeral 2 denotes a pipe for supplying the liquid to eject to the nozzle 1 to fix the nozzle 1 to the grip portion 5, reference numeral 3 denotes a grip portion 5 and It is a tube for supplying liquid to the nozzle 1 from the main body 16 shown in FIG. 3 via the pipe 2. Reference numeral 4 denotes an electric wire for supplying power to the grip portion 5 and the video scope and transmitting a signal from the video scope to the main body 16.

The grip portion 5 includes a power supply battery, a toothbrush driving motor, a video scope signal processing circuit, an image transmission circuit, various control circuits, and the like. In addition, the grip part 5 is provided with a control switch 6 for controlling the operation of the video scope and driving the injection of the liquid and the electric toothbrush. In addition, the grip portion 5 is equipped with a video scope stand 7 supporting the head portion 13 of the video scope.

Reference numeral 8 denotes a CCD unit in which a CCD, which is a solid state image pickup device, is disposed at the tip and a drive circuit and a signal processing circuit board are disposed at each terminal thereof. Reference numeral 9 denotes an image on the light receiving surface of the CCD of the CCD unit 8 by the objective lens. Reference numeral 10 reflects the imaging light with a prism mirror. An iris stop is provided between the CCD unit 8 and the prism mirror 10 to adjust the viewing angle, the depth of focus, and the like, but the drawings are omitted here. The imaging means is constituted by these prism mirrors 10, the iris diaphragm and the objective lens 9.

Reference numeral 11 is a white LED illuminating the subject. Reference numeral 12 denotes an optical screen made of glass or the like which transmits visible light so as to be sealed from the outside to perform a waterproof function so that light from the subject can be incident on the prism mirror 10. The CCD system 8 and the imaging means constitute an imaging system. This imaging system and lighting means (white LED 11) constitute the head part 13 of the video scope. This head portion 13 is attached to the video scope stage 7 via a hinge 14, and the head portion 13 is inclined at an appropriate angle with the hinge 14 as an axis.

Although the video scope stand 7 is fixed by the grip part 5, although the electrical wiring which supplies various signals and electric power is provided in this video scope stand 7, it abbreviate | omits in this figure.

The main body 16 of FIG. 3 is provided with a tank which accumulates the liquid to be injected, and a pump which sends the liquid in the tank to the nozzle 1 through the tube 3, but is omitted in this drawing. The image captured by the video scope is displayed on the display unit 17 provided in the main body 16. The main body 16 also has a charging function. It is also used as an installation device when not in use. Furthermore, an image receiving circuit and a display circuit for receiving an image captured by a video scope and transmitted are also provided. This makes it easy to operate and makes it possible to make a small space, thereby facilitating the spread in homes and the like.

FIG. 1 illustrates the arrangement of each component of an oral irrigator having a video scope according to the present embodiment, and the cleaning operation may be performed by spraying a liquid while checking the teeth or gums of the video scope as an image. . The injection of this liquid is controlled by the switch 6.

The head part enters the inside of the oral cavity from the pipe 2 and the video scope stand 7, the teeth or gums are observed by the display unit 17, and the liquid is sprayed to perform the cleaning operation. In this cleaning, when the nozzle 1 and the object are at a proper distance, the target portion of the liquid from the nozzle 1 in the image of the display unit 17, that is, the object is positioned at the aiming marker indicated by 18. Adjust the angle of the head portion 13 and / or the position of the aiming marker 18 which can be placed on the display portion 17 so as to be.

With this adjustment, the viewing angle or focal length of the imaging system, the depth of field, and the illumination angle and intensity of the luminaire are sharply and adjusted so that the object is imaged at an appropriate size. In this way, by displaying the aiming marker 18 on the image of the display part 17, it can wash | clean more effectively. The main body 16 is provided with a switch 19 for adjusting the position and aiming strength of the aiming marker 18. In addition, on the display unit 17, for example, a specific object is clearly displayed, and when the object comes to the position of the aiming marker 18, the liquid from the nozzle 1 reaches the object.

As can be seen in FIG. 2, when the nozzle 1 and the pipe 2 are removed from the grip part 5, and the toothbrush 15 is installed on the toothbrush stand of the grip part 5, the toothbrush brushing operation can also be performed. In this case, the tube 3 can be removed and used. At this time, it is easy to use if the angle of the head 13 is adjusted so that the tip of the brush is in the image forming range. Moreover, the electric wire 4 can also be removed and used by transmitting the image to the main body 16 by electromagnetic waves or the like by driving the video scope as the power source in the grip unit 5. This makes it easier to use.

As described above, it is possible to actually check and clean the image that the position observed with the video scope coincides with the position at which the liquid is ejected, and the practical effect is very large. Moreover, brushing is also possible and efficient as required.

In this regard, in the present embodiment, an example in which the nozzle 1 and the pipe 2 are separated when the toothbrush 15 is mounted is shown, but it is not necessary to do this. However, if the toothbrush 15, the nozzle 1 and the pipe 2 are simultaneously mounted to the video scope, the grip 5 or the like can be enlarged.

(Second embodiment)

Fig. 4 is a side view of the portion except for the display portion 17 of the oral irrigator having the video scope of the second embodiment of the present invention. In FIG. 4, the code | symbol 1-14 is the same target as the code | symbol 1-14 of FIG. 1, and has the same function. Reference numeral 20 denotes a nozzle for injecting liquid such as water onto the optical screen 12. The liquid is sent to the grip section 5 through the tube 3 of the body 16 and from the grip section 5 to the nozzle 20 through a pipe housed in the video scope stage 7. The injection of the liquid for cleaning the optical screen 12 is controlled as described below by the switch 6 provided in the grip portion 5.

During the cleaning operation of the object by the liquid from the nozzle 1, bubbles or water droplets are liable to occur, and these bubbles or water droplets adhere to the optical screen 12 to obstruct imaging. At this time, by operating the switch 6, the liquid is sprayed from the nozzle 20 onto the optical screen 12 to remove the adhered bubbles or water droplets. When the removal can be confirmed by the image picked up or the like, the control switch 6 can be operated to stop the ejection of the liquid from the nozzle 20.

As described above, the nozzle 20, which is a means for injecting an object, is installed on the optical screen 12 to control this, so that the position observed with the video scope coincides with the position at which the liquid is sprayed. If the image is interrupted by bubbles or water droplets adhering to the optical screen 12 during the cleaning operation while checking, this can be eliminated. Thereby, even in the washing | cleaning operation, it can confirm with a stable image, and a practical effect is very big.

In this regard, the jetting from the nozzle 20 can be not only a liquid but also a gas. In short, a fluid is enough.

(Third Embodiment)

Referring to Fig. 4, a third embodiment of the present invention will be described.

In the second embodiment, when bubbles or water droplets adhere to the optical screen 12 and impede the imaging during the cleaning operation, the liquid is sprayed from the nozzle 20 to the optical screen 12 by attaching the switch 6. Remove one bubble or drip. At this time, when the spraying speed of the liquid to the cleaning object from the nozzle 1 is large, the bubbles or water droplets adhere to the optical screen 12 immediately after they are removed even after removal due to the liquid spraying from the nozzle 20. To interfere with imaging.

In order to cope with such a case, according to this embodiment, the nozzle 1 and the nozzle 20 are automatically alternately sprayed with liquid. By controlling the liquid sent by the pump provided in the main body 16 with the switching valve provided in the grip part 5, the liquid can be sprayed alternately from the nozzle 1 and the nozzle 20. Thus, when there is one pump provided in the main body 16, by spraying alternately, the bubble or water droplet on the optical screen 12 can be removed, without reducing the injection quantity and speed of the nozzle 1.

As described above, the nozzle 20, which is a means for injecting liquid onto the optical screen 12, and the nozzle 1 for injecting liquid into the object to be cleaned alternately inject liquid, so that even in the case of one pump, It does not reduce the injection quantity and speed of 1), and a practical effect is very big.

(Example 4)

A fourth embodiment of the present invention will be described with reference to FIG.

In this embodiment, the liquid is pulsated when the liquid is ejected from the nozzle 1 for cleaning. In short, the injection amount and / or velocity of the liquid from the nozzle 1 is changed periodically, for example. As described above, a mass effect is exerted by increasing the instantaneous maximum injection amount and speed. Then, such pulsations automatically synchronize the nozzle 1 and the nozzle 20 alternately. Thereby, as in the third embodiment, even in the case of one pump 1, bubbles or water droplets on the optical screen 12 can be removed without reducing the jet speed of the nozzle 1. Moreover, this embodiment is advantageous in practical use because it is used in combination with a conventional pulsating operation.

In addition, when the pulsation frequency is 20 Hz or more, the visual recognition degree of alternately jetting the cleaning object and the optical screen 12 is reduced, so that it can be observed continuously without any discomfort.

As described above, the spray timing is pulsed to the cleaning object to synchronize the switching timing between the nozzle 1 and the exposure 20, so that even if there is only one pump, bubbles and water droplets on the optical screen 12 can be reduced without lowering the injection amount and speed. Can be removed. Moreover, the construction of this mechanism is practically advantageous. In addition, it can observe continuously without any discomfort and the practical effect is also very large.

(Example 5)

A fifth embodiment of the present invention will be described with reference to FIG.

In this embodiment, as in the third and fourth embodiments, the nozzle 1 and the nozzle 20 automatically spray liquid alternately, or the injection amount and speed of the nozzle 20 spraying onto the optical screen 12. Is lowered compared to the nozzle (1).

The flow rate and speed required to remove bubbles or water droplets are sufficiently low compared to the flow rate and flow rate required for cleaning. Therefore, in the case of one pump, since the injection amount and speed of the nozzle 20 are reduced, as a result, the injection amount and speed of the nozzle 20 can be improved. That is, the nozzle capacity can be accumulated during the injection period from the nozzle 20 by limiting the injection amount and speed from the nozzle 20.

As described above, the nozzle 20, which is a means for injecting liquid onto the optical screen 12, and the nozzle 1 for injecting liquid into the object to be cleaned alternately eject the liquid, and the amount and speed of ejection from the nozzle 20. By lowering the pressure, even when one pump is used, the injection amount and speed of the nozzle 1 can be sufficiently secured, and the practical effect is very large.

On the other hand, although the nozzle 20 for removing the deposit of the optical screen 12 was provided separately from the nozzle 1 as the fifth embodiment to the fifth embodiment, the function of the nozzle 20 functions as the nozzle 1. ), The nozzle 20 may not be provided.

(Example 6)

Fig. 5 is a side view of a portion excluding the display portion 17 of the oral irrigator having the video scope of the sixth embodiment of the present invention. 3, 4, and 7-14 of FIG. 5 are similarly arrange | positioned with the same component as 3, 4, and 7-14 of FIG.

Numeral 21 denotes a nozzle for injecting liquid into the object to inject liquid supplied from the main body through pipes, grips 23 and tubes 3 provided in the video scope stage 7. Reference numeral 23 denotes a grip portion, and reference numeral 24 denotes a control switch for controlling injection or the like provided in the grip portion 23. Although the grip part 23 shown in the present Example cannot install a toothbrush, it is smaller than the grip part 5, and handling property improves. In Fig. 5, reference numeral 22 denotes a piezoelectric vibrator manufactured from, for example, barium titanate porcelain, which vibrates light screen 12 at a frequency of 28 KHz, for example. This piezoelectric vibrator 22 is controlled by the control switch 24.

When bubbles or water droplets generated during the cleaning operation adhere to the optical screen 12 and interfere with the imaging, the piezoelectric vibrator 22 is vibrated slightly to operate the switch 24 so that the bubbles or water droplets attached to the optical screen 12 are removed. Remove When the removal can be confirmed by the picked-up image or the like, the micro switch is stopped by operating the control switch 24.

Further, when the vibration is slightly vibrated at the same time as the start of the cleaning operation to make bubbles or water droplets difficult to adhere, there is a further effect.

As described above, the optical screen 12 is controlled by providing a means for vibrating microscopically, and the cleaning operation is performed while confirming with the image that the position observed with the video scope coincides with the position where the liquid is sprayed. At the same time, when bubbles or water droplets adhere to the optical screen 12 and interfere with imaging, this can be eliminated. This makes it possible to confirm a stable image even during the cleaning operation, and the practical effect is very large.

On the other hand, in the sixth embodiment described above, the piezoelectric vibrator 22 is made of berylnium titanate porcelain, but the piezoelectric vibrator 22 is not limited to be made of berylnium titanate porcelain. In other words, the piezoelectric vibrator 22 may be made of any material as long as it vibrates the optical screen 12. In addition, although the piezoelectric vibrator 22 vibrates the optical screen 12 at the frequency of 28 KHz, the vibration frequency is not limited to 28 KHz.

(Example 7)

The seventh embodiment is constructed as shown in Fig. 5 as in the sixth embodiment, but the optical screen 12 is waterproofed. Specifically, a straight alkyl chain represented by CF ₃ (CF ₂ ) _n (CH ₂ ) ₂ SiCl ₃ (where n is an integer of 0 or 1 or more) or the like is formed on the outer surface of the optical screen 12. Waterproofing is carried out by the silane binder having. The film thickness of this waterproofing treatment is substantially 10 nm or less and completely transmits visible light.

If bubbles or water droplets generated during the cleaning operation adhere to the optical screen 12 and interfere with imaging, the switch 24 is operated to micro-vibrate the piezoelectric vibrator 22 to remove the bubbles or water droplets attached to the optical screen 12. Remove When the removal can be confirmed by the image picked up or the like, the micro switch is stopped by operating the control switch 24. At this time, since the light screen 12 is waterproofed, it is easy to remove bubbles and water droplets.

As described above, by waterproofing the optical screen 12, it is easy to remove bubbles and water droplets, and it is possible to confirm a stable image even during the cleaning operation, and the practical effect is very large.

In addition, as the waterproofing treatment, an example of a silane binder having a linear alkyl bond represented by CF ₃ (CF ₂ ) _n (CH ₂ ) ₂ SiCl ₃ (where n is an integer of 0 or 1 or more) is shown. If only the permeability is secured, even with a dimethyl silicone organic polymer waterproofing agent, an effect of making it easy to remove deposits such as bubbles is obtained.

On the other hand, the present embodiment has shown an example of removing bubbles or water droplets by micro-vibrating the waterproofed optical screen 12, even when spraying gas or liquid onto the optical screen 12 to remove bubbles or water droplets. Waterproofing is similarly effective.

(Example 8)

As an eighth embodiment, hydrophilic treatment is performed on the optical screen 12 in FIGS. 1, 2, 4, and 5.

Hydrophilic treatment is performed on the outer surface of the optical screen 12, and bubbles and water droplets disintegrate, and imaging is hardly disturbed. In addition, this hydrophilic treatment has a defogging effect, which can prevent the blurring of the captured image at the start of use, and the practical effect is very large.

As described above, the oral irrigator having the video scope of each embodiment of the present invention can simultaneously perform observation and inspection of the inside of the oral cavity, and maintenance operations such as brushing, so that the practical effect is very large.

On the other hand, although the nozzle 1 or the nozzle 21 was said to inject liquid in each said embodiment, it can inject gas. That is, the nozzle 1 or the nozzle 21 only needs to wash the object, such as a gum or a gum, by spraying a fluid.

In addition, the display unit 17 may be mounted to be fitted to a part of the mirror of the washroom, and may be mounted to the user's head.

As is clear from the above description, according to the present invention, an oral irrigator having a video scope capable of cleaning the inside of the oral cavity while actually confirming with the image that the position observed by the video scope coincides with the location where the fluid is ejected is matched. I can provide it.

Claims (16)

A video scope having an imaging means for forming light from an object, an imaging device for converting light formed by the imaging means into an electrical signal, and a first grip portion held by an operator; A display unit which displays an image picked up by the video scope; And a mouthwasher having a nozzle for injecting fluid and a second grip portion held by an operator, for injecting the fluid into teeth or gums to clean the mouth. And the first grip portion and the second grip portion can be integrated. The method of claim 1, And the display unit displays an aiming marker indicating an arrival target point of the fluid ejected from the nozzle on an image captured by the video scope. The method of claim 1, And a toothbrush section having a brush section and a third grip section held by the operator, wherein the third grip section and the first grip section can be integrated. The method of claim 1, An oral irrigator having a video scope, characterized by adding lighting means for illuminating the object. The method of claim 1, The video scope has an optical screen that transmits light from the object and adds removal means for removing an attachment to the optical screen, and the imaging means images light from the object that has passed through the optical screen. An oral irrigator having a video scope. The method of claim 5, And said removing means is injection means for injecting fluid. The method of claim 5, And a video scope, wherein the fluid is alternately injected into the object and the optical screen. The method of claim 6, And said nozzle acts as said dispensing means. The method of claim 7, wherein And the nozzle pulsates and injects the fluid so that the fluid is alternately ejected to the object and the optical screen in synchronization with the pulsation. The method of claim 6, And a spray speed of the fluid on the optical screen is controlled to be lower than a spray rate of the fluid of the object. The method of claim 5, And said removing means is a vibrating means for vibrating said optical screen. The method of claim 5, And a control means installed in the first grip part, the second grip part, or the third grip part to control an operation of the removing means. The method of claim 5, And the optical screen is waterproof and has a video scope to ensure transmission of visible light. The method of claim 13, The waterproofing treatment is a mouthwash with a video scope, characterized in that using a dimethyl silicone organic polymer waterproofing agent or a silane binder having a linear alkyl bond. The method of claim 5, And said optical screen is hydrophilic and secures transparency to visible light. The method according to any one of claims 1 to 15, And the display unit is installed in a charger for charging a device installed in the first grip unit or the second grip unit, or in an installation unit in which the first grip unit is installed when not in use.